Mike Reed, a musician and Uber driver in Arizona, said he quit drinking alcohol more than a decade ago when his roommates got so fed up with his unruly behavior that they threatened to kick him out. Sobriety became such a core part of Reed’s identity that he launched an online dating website called “Single & Sober,” but in 2020, Reed, a Navy veteran, said he found himself struggling as his sister, who had Down syndrome, was dying of cancer. Reed, 43, began smoking marijuana. More recently, he we